Firefly Aerospace's new rocket engine spouts green flames in 1st 'hot fire' test (photo) 

 Firefly Aerospace shared a photo of the first hot fire test of its new Miranda engine, slated for use aboard the upcoming Antares 330 rocket being developed along with Northrop Grumman. 

https://cdn.mos.cms.futurecdn.net/Z226TBnr2GiPiDEoG9JaqM.jpg

https://www.space.com/firefly-aerospace-miranda-engine-hot-fire-test-photo